The compensation device narrowband interference

 

The invention relates to radio engineering. The technical result is to increase the degree of suppression of narrowband interference. The invention consists in that in the known device compensation containing the amplifier and myCitadel included in the N-th channel, is entered first, second and third multiplier products, the first and second low pass filters, the filtration unit and the generation of control voltage, a controllable oscillator, the key, the amplitude detector and the block of comparison with the threshold, and entered (N-1) channels, similar to the N-th channel on the composition of the blocks and connections between them. 2 Il.

The invention relates to electrical engineering and can be used in the receiving device.

The known device compensation narrowband interference, as described in.with. No. 1688416, N 04 1/10, and also in patent No. 2034402, N 04 1/10 from 30.04.95, and others, the lack of which is the low degree of suppression of narrowband interference.

The closest to the technical nature of the claimed device is a device for noise compensation described in article Efimov, C. P. “evaluation of the effect of the nonlinear Converter on the robustness of the technique in satellite networks”, published in GA scheme of which is shown in Fig.1, showing: 1 - power; 2 - myCitadel; 3 - limiter; 4 - band-pass filter.

The device prototype contains connected in series amplifier 1 and myCitadel 2 whose output is the output of the device and connected in series limiter 3 and the band-pass filter 4, the output of which is connected with the second input vicites 2, and the inputs of the amplifier 1 and the stopper 3 are combined and input devices.

The device prototype works as follows.

The input mixture signal and N-narrowband noise from the input device enters the block 1, where its gain, after which the mixture is fed to the first input unit 3, the second input of which receives the assessment of narrowband interference, which is formed due to limitations of the input mixture in block 3 with subsequent filtering of the restrictions in unit 4. Due to the subtraction in block 2 of the input mixture assessment of narrow-band interference at the output signal is allocated and remains uncompensated narrowband interference.

The disadvantage of the prototype is the low degree of suppression of narrowband interference.

To eliminate this drawback in the device compensation narrowband interference, containing the amplifier and visitate channel, which also entered serially connected third multiplier, a second low pass filter, the amplitude detector and the power comparison threshold; sequentially connected to the first multiplier, the first lowpass filter, the filtering unit and the generation of control voltage and a controllable oscillator; sequentially connected to the second multiplier and the key, a control input connected to the output of the comparison with the threshold, and with the control input of the filtration unit and generating control voltages; thus the output of the second lowpass filter after the amplifier is connected to the first signal input of the second multiplier, the second reference input connected to the second reference input of the third multiplier and to the first output of the controlled oscillator, the second output of which is connected to a second reference input of the first multiplier; in addition, the output of the key is connected to a second input of myCitadel, the first input connected to the first signal inputs of the first and third multiplier products and to the input of the N-th channel, and entered (N-1) channels, similar to the N-th channel in the composition of units and links between them, with the input of the first channel is the input device, the output of the first Kai diagram of the device shown in Fig.2, showing: 1 - power; 2 - myCitadel; 3, 7, 9 first, second and third multiplier products; 4, 10, the first and second low pass filters; 5 - block filtering and generation of control voltages; 6 - driven generator; 8 - key; 11 - amplitude detector; 12 - unit comparison threshold.

The proposed device comprises N serially connected channels having the same composition of units and connections. The input of the first channel is the input device, the output of the first channel is connected to the input of the second channel, the output of the second channel is connected to the input of the third channel, and so on, the output (N-1)-th channel is connected to the input of the N-th channel whose output is the output device.

In each channel by the formation of the evaluation one of the M narrowband interference (MN) and its compensation. If the input signal of the first channel contains the M narrowband interference, the input signal of the second channel will contain M-1 narrowband interference, the third channel M-2 narrowband interference, etc.

Each of the N channels contains myCitadel 2, the first input of which is the channel input, and the output of the output channel includes serially connected first multiplier 3, the first signal input of which is connected to I the renewable generator 6, the first output of which is connected to a second reference input of the multiplier 3; contains serially connected second multiplier 7 and the key 8, the output of which is connected to a second input of vicites 2, while the second reference input of the multiplier 7 is connected to the first output of the controlled oscillator 6 and the second reference input of the third multiplier 9, the first signal input of which is connected to the first input of vicites 2, and the output of the multiplier 9 through the low pass filter 10 is connected to the input of the amplitude detector 11 and to the input of amplifier 1, the output of which is connected to the first signal input of the second multiplier 7, and the output of the amplitude detector 11 through the power comparison threshold 12 is connected with the control input of the key 8 and the managing input filtering unit and generating control voltages 5.

The inventive device operates as follows. The input mixture containing the useful signal and narrowband interference, is fed to the input of the first channel, where the frequency search narrowband noise in a given frequency range, the capture of one (first) narrowband interference, formation evaluation and subsequent compensation. The output signal of the first channel is fed to the input of the second channel, where the OS which provides the grip on the second frequency interference, formation evaluation and compensation in the input mixture fed to the input of the second channel with the first channel. Similar procedures are carried out in the 3rd, 4th,...,(N-1), the N-th channels. From the output of the N-th channel signal is sent to the output device.

Given that all channels compensation narrowband interference have the same build, consider the work of one of the first channel.

The input mixture containing the useful signal and narrowband interference, is supplied to the first signal input unit 9, the second reference input voltage from the first output unit 6. In block 9 after multiplying the narrowband interference with the voltage supplied from the first output unit 6, the output of block 9 will be present voltage with the sum and difference frequencies, which is supplied to the unit 10. Block 10 is the low pass filtering of the voltage taken from the output unit 9. The signal output unit 10 occurs when the difference between the frequency of the captured narrowband interference and frequency of the controlled oscillator falls within its bandwidth. From the output of the unit 10, the voltage is applied to the block 11, where due to amplitude detection is allocated its envelope received at block 12, where it is comparing is, the and the second reference input voltage with the second output unit 6.

After multiplying the narrowband interference voltage unit 6 at the output of block 3 also stands out voltage with the sum and difference frequencies, which is supplied to the unit 4, where the low pass filtering. The output of block 4 there is tension in the case, when the voltage difference frequency will fall within its bandwidth. The voltage output unit 4 is supplied to the first signal input unit 5, the second control input of which is energized from the output of the block 12.

In the absence of a threshold in block 12 at its outputs the control signal is a logical zero (“0 LOG”). In this case, the unit 5 generates at its output a sawtooth voltage which is supplied to the control input of the unit 6 and provides the scan mode, its frequency in a predetermined frequency range corresponding to the band of the spectrum of the useful signal. In case of exceeding the threshold in block 12 at its outputs the control signal is a logical unit (“LOG 1”) corresponding to the capture of one (first) interference. This command, when the control input unit 5 changes the mode of its operation. In this case, unit 5 builds on the lane interference.

By changing the frequency of the controlled oscillator 6 to adjust the phase of its output signal to the phase of the narrowband interference, which must be compensated. Mode of synchronism, when the phase error of the output signal of the block 6 and narrowband interference has a minimum value, the output of block 10 will be deducted constant component, which determines the amplitude of the narrowband interference. The signal unit 10 through the block 1 is supplied to the first input unit 7, the second input of which receives the signal from the first output unit 6. By multiplying these signals at the output of block 7 estimation of narrowband interference. The ratio of the transmission unit 1 is chosen so as to ensure equality of amplitude estimation of narrowband interference the amplitude of the first narrowband interference in the input mixture. At the same time command (“LOG 1”) from the output of block 12 is supplied to the control input unit 8, Opera it and providing an evaluation of the first narrow-band interference to the second input unit 2, where it compensates for the corresponding narrowband interference in the input mixture coming from the input device to the first input unit 2, the output of which is input mixture, from which are excluded the first obstacle that comes in is: 51, 54, the first and second multipliers for constant coefficients1 and2; 52 - inverter; 53 switch; 55 drive; 56, 59, the first and second registers; 57 - pulse generator; 58, 510, the first and second adders; 511 - block of memory; 512 - analog-to-digital Converter.

Block 5 contains serially connected memory block 511, the switch 53, the first adder 56, the first register 58, a second adder 510 whose output is the output of block 5, serially connected analog-to-digital Converter 512, the input of which is the signal input unit 5, the second multiplier by a constant factor2 54, the second register 59, the output of which is connected to a second input of the second adder 510, contains the first multiplier by a constant factor1 51, an input connected to the output of the analog-to-digital Converter 512, and the output from the second signal input of the switch 53, and a generator of clock pulses 57, an output connected to the first clock input of the first register 58 and to the first clock input of the second register 59, the inverter 52, an input connected to the first Manager of the input switch 53 and is the managing unit is egistra 58 is grounded and the output of the first register 58 is connected to a second input of the first adder 56.

Unit 5 operates as follows.

Until the threshold is not exceeded, the output unit 12 (Fig.2) to the inputs of blocks 52 and 53 (Fig.3) receives a logical zero. In this case, the output of block 52 is formed by a logical unit, which clears the block 59 and the block 53 connects to the input unit 55, the output of block 511, which generates a constant number And specifying step adjustment device according to the frequency when searching for narrowband interference. When entering from the output of the block 57 on the clock input unit 58 of clock pulses in the unit 58 records the result of the addition in block 56 a constant number And defining the step frequency tuning from block 511 through the blocks 53 and 56 with the numerical value stored in block 58. So the code Ureg.the output of block 58 for time t=(n+1)T (where T is the period of clock pulses at the output of block 57, n - number) is determined by the equalities Ureg.((n+1)T) = Ureg.(nT)+if Ureg.((n+1)T)<2 mand Ureg.((n+1)*T)=Ureg.(n*T)+-2mif Ureg.((n+1)*T)you can provide a frequency block 6 with the desired speed in a given frequency range. The output code block 58 is supplied to the first input unit 510, the second input of which (until the threshold is exceeded in block 12), the output of block 59 (Fig.3) are zeros. When you change the output code block 58, the output code block 510 will change and rebuild the frequency block 6 (see Fig.2).

When the frequency difference between the frequency signal of the block 6 and the frequency of the interference will be less than the cutoff frequency of the block 10, the output of block 11 will appear constant component exceeding the threshold in block 12. The output of block 12 is a logical zero to change to a logical unit. Logical unit from the output of block 12 is supplied to a block 53 which this command disconnects from the input unit 55, the output unit 511 and attaches to it the output of block 51. At the same time a logical unit through the block 52, exercising its inversion, is applied to a second input of the block 59, allowing write code from block 54. As a result of the switching unit 6 (Fig.2) enters the tracking mode for the seized Scopoli is in digital form, to the input of block 54 (Fig.3), which multiply it by a constant factor2.

From the output of block 54 digital code is supplied to the signal input unit 59. Record digital code in the block 59 is carried by ticks, coming from block 57 at its first, the clock input. The phase error signal taken from the output of the unit 4 (Fig.2), through the block 512, which converts the signal into digital form, and the block 51, which provides multiplication by a constant factor1, is fed to the input drive 55, consisting of serially connected adder 56 and register 58. Drive 55 that performs the function of integrating digital device, increases the order of astatism and the accuracy of the device phase-locked loop. In the adder 510 code register 59 is folded code register 58 and is supplied to the input unit 6.

Block 511 may be made in the form of register with feedback, in which the recorded code and clock pulses, the output of which clock pulses to the clock input of the register, which results in the entry code And the input of the switch 53.

Structural block circuit 6 shown in Fig.4, where indicated: 61 - perestroika is 1 and the phase shifter 90when this control input unit 61 is a control input unit 6, and the output unit 61 is connected to the first output unit 6 directly, and with a second entrance through the block 62.

Unit 6 operates as follows.

The control unit 61 receives the control voltage output unit 5, in accordance with which change the frequency of harmonic oscillations generated by block 61. From the output of block 61 harmonic oscillation is supplied to the first output unit 6 directly, and the second output - through block 62.

The block 61 is a known device used in the systems phase lock frequency (see Dixon, R. K. Broadband system. - M.: Communication, 1979, page 144, Fig.5.15).

The prototype provides the highest degree of compensation in the presence of the input single narrowband interference known amplitude equal to the level of the limiter. Under the simultaneous effect of N narrowband interference at different levels in the prototype due to limitations of the input mixture narrowband interference high level inhibit weaker narrowband interference. Therefore, the amplitude of the estimated narrowband interference differ from the amplitudes of the corresponding narrowband interference in the input mixture, thereby slagelsegade in a separate channel, this eliminates the possibility of redistribution of the amplitude estimates of narrow-band interference due to their mutual influence. Resulting in the inventive device, the degree of suppression of narrowband interference is higher than in the prototype.

Claims

The compensation device narrowband interference, containing the amplifier and myCitadel whose output is the output of the device, characterized in that the amplifier and myCitadel included in the blocks of the N-th channel, which also entered serially connected third multiplier, a second low pass filter, the amplitude detector and the power comparison threshold; sequentially connected to the first multiplier, the first lowpass filter, the filtering unit and the generation of control voltage and a controllable oscillator; sequentially connected to the second multiplier and the key, a control input connected to the output of the filtering unit and generating control voltages; thus the output of the second lowpass filter after the amplifier is connected to the first signal input of the second multiplier, the second reference input connected to the second reference input of the third multiplier and to the first output progo, the exit key is connected to the second output myCitadel, the first input connected to the first signal inputs of the first and third multiplier products and to the input of the N-th channel; and introduced N-1 channels, similar to the N-th channel on the composition of the blocks and connections between them, and the entrance of the first channel is an input device, the output of the first channel is connected to the input of the second channel, the output of the second channel is connected to the input of the third channel, and so on, the output (N-1)-th channel is connected to the input of the N-th channel, the output which is the output device.

 

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